<template>
  <div>
    <el-row
      type="flex"
      justify="end"
    >
      <!-- 年 用组件的给定一个日期 -->
      <el-select
        v-model="currentYear"
        size="small"
        style="width: 120px"
        @change="dataChange"
      >
        <el-option
          v-for="item in yearList"
          :key="item"
          :label="item"
          :value="item"
        />
      </el-select>
      <el-select
        v-model="currentMonth"
        size="small"
        style="width: 120px;margin-left:10px"
        @change="dataChange"
      >
        <el-option
          v-for="item in 12"
          :key="item"
          :label="item"
          :value="item"
        />
      </el-select>
    </el-row>
    <!-- 放置日历组件 -->
    <el-calendar v-model="currentDate">
      <template
        v-slot:dateCell="{ date, data }"
        class="content"
      >
        <div class="date-content">
          <span class="text"> {{ data.day | getDay }}</span>
          <span
            v-if="isWeek(date)"
            class="rest"
          >休</span>
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
export default {
  filters: {
    getDay (value) {
      // 2021-08-08  2021-08-18
      const day = value.split('-')[2] // 08  18
      return day.startsWith('0') ? day.substr(1) : day // 8 18
    }
  },
  props: {
    startDate: {
      type: Date,
      default: () => new Date()
    }
  },
  data () {
    return {
      yearList: [], // 遍历的年数组
      currentYear: null, // 当前年份
      currentMonth: null, // 当前月份
      currentDate: null
    }
  },
  created () {
    // 获取当前的年份
    this.currentYear = this.startDate.getFullYear() // 得到当前的年份
    this.currentMonth = this.startDate.getMonth() + 1 // 当前月份
    // 快速生成数组的方法
    this.yearList = Array.from(Array(11), (value, index) => this.currentYear + index - 5)
    // 钩子函数执行完成之后
    this.dataChange() // 主动调用一下方法
  },
  methods: {
    // 是否是休息日
    isWeek (value) {
      return value.getDay() === 6 || value.getDay() === 0
    },
    dataChange () {
      // 生成新日期
      const year = this.currentYear
      const month = this.currentMonth
      this.currentDate = new Date(`${year}-${month}-1`) // 以当前月的1号为起始
    }
  }
}
</script>

<style  scoped>
/deep/ .el-calendar-day {
  height: auto;
}
/deep/ .el-calendar-table__row td,
/deep/ .el-calendar-table tr td:first-child,
/deep/ .el-calendar-table__row td.prev {
  border: none;
}
.date-content {
  height: 40px;
  text-align: center;
  line-height: 40px;
  font-size: 14px;
}
.date-content .rest {
  color: #fff;
  border-radius: 50%;
  background: rgb(250, 124, 77);
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
  font-size: 12px;
  margin-left: 10px;
}
.date-content .text {
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
}
/deep/ .el-calendar-table td.is-selected .text {
  background: #409eff;
  color: #fff;
  border-radius: 50%;
}
/deep/ .el-calendar__header {
  display: none;
}
</style>
